Internal pressure regulating marker pen

Patent metadata

Field	Value
Publication number	US-10603947-B2
Application number	US-201715490171-A
Country	US
Kind code	B2
Filing date	Apr 18, 2017
Priority date	Apr 21, 2016
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

A writing implement is configured to dispense material onto a work surface. The writing implement includes a body having a first end, a second end, and an inner surface. The writing implement also includes a nib coupled to the first end. The nib is configured to allow the material to be dispensed onto the work piece. The writing implement further includes a pressure regulating assembly coupled to the body. The pressure regulating assembly and the inner surface define a cavity configured to hold the material. The pressure regulating assembly is moveable relative to the body in response to a pressure change within the cavity.

First claim

The invention claimed is:

1. A writing implement configured to dispense material onto a work surface, the writing implement comprising:
a body including a first end, a second end, and an inner surface;
a nib coupled to the first end, the nib configured to allow the material to be dispensed onto the work surface;
an absorbent porous end cap coupled to the second end and configured to allow ambient air to pass through the absorbent porous end cap;
a piston having a first surface facing the first end and a second surface facing the second end, the piston comprising a groove positioned between the first surface and the second surface; and
a seal coupled to the piston and located within the groove, wherein at least one of the piston and the seal slidably engages the inner surface of the body.

2. The writing implement of claim 1 , wherein a volume of a cavity increases as the piston moves toward the second end in response to the pressure within the cavity increasing above a desired pressure within the cavity.

3. The writing implement of claim 2 , wherein the volume of the cavity decreases as the piston moves toward the first end in response to the pressure within the cavity decreasing below the desired pressure within the cavity.

4. A writing implement configured to dispense material onto a work surface, the writing implement comprising:
a body including a first end, a second absorbent porous end that defines an exterior surface of the body, and an inner surface;
a nib coupled to the first end, the nib configured to allow the material to be dispensed onto the work surface; and
a pressure regulating assembly coupled within the body, the pressure regulating assembly and the inner surface defining a cavity configured to hold the material at a desired pressure, the pressure regulating assembly comprising a piston having a first surface that faces the first end and a second surface that faces the second end, the piston comprising a first chamfer on the first surface and a second chamfer on the second surface, the piston being moveable relative to the body to control an actual pressure within the cavity relative to the desired pressure.

5. The writing implement of claim 4 , wherein a volume of a cavity increases as the piston moves toward the second end in response to the actual pressure within the cavity increasing above the desired pressure within the cavity.

6. The writing implement of claim 5 , wherein the volume of the cavity decreases as the piston moves toward the first end in response to the actual pressure within the cavity decreasing below the desired pressure within the cavity.

7. The writing implement of claim 4 , wherein the piston includes a groove positioned between the first surface and the second surface and a seal within the groove, wherein the groove is sized to receive the seal, and wherein at least one of the piston and the seal slidably engages the inner surface of the body.

8. The writing implement of claim 4 , wherein the second absorbent porous end includes an absorbent porous end cap so that the piston is coupled between the absorbent porous end cap and the nib, and wherein the absorbent porous end cap is configured to allow ambient air to pass through the absorbent porous end cap.

9. The writing implement of claim 1 , further comprising a first chamfer located between the groove and the first surface and a second chamfer located between the groove and the second surface.

10. The writing implement of claim 1 , wherein the seal comprises four arcuate concave sides.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Ballard James G

Classifications

• B43K8/04

  Arrangements for feeding ink to writing-points · CPC title

• B43K8/02 Primary

  with writing-points comprising fibres, felt, or similar porous or capillary material (B43K8/22 takes precedence) · CPC title

• B43K23/08

  Protecting means, e.g. caps · CPC title

• B43K5/06 Primary

  with movable pistons {for withdrawing ink from an ink-receptacle (B43K5/1818 takes precedence)} · CPC title